S
M
T
W
T
F
S
30
74°
43°
31
75°
46°
1
83°
50°
2
79°
48°
3
78°
51°
4
80°
50°
5
78°
47°
6
80°
49°
7
78°
49°
8
81°
50°
9
81°
52°
10
80°
52°
11
82°
49°
12
79°
49°
13
80°
50°
14
80°
49°
15
79°
47°
16
79°
37°
17
75°
36°
18
67°
39°
19
65°
34°
20
67°
41°
21
71°
47°
22
76°
47°
23
Hist. Avg.
70°
40°
24
Hist. Avg.
70°
40°
25
Hist. Avg.
69°
40°
26
Hist. Avg.
69°
39°
27
Hist. Avg.
68°
39°
28
Hist. Avg.
68°
38°
29
Hist. Avg.
67°
38°
30
Hist. Avg.
67°
38°
1
Hist. Avg.
66°
37°
2
Hist. Avg.
66°
37°
3
Hist. Avg.
65°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Havre
Havre's September 2026 forecast shows daily high temperatures ranging from 65° to 83°, with overnight lows between 34° and 52°. The average high for September is 77° with an average low of 46°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Havre. See also: October | November | December.
